Does the Throwout Bearing Spin All the Time?

Its outer surface is always spinning, whether the clutch is engaged or disengaged. It is self-adjusting, meaning that the spring between the bearing and base puts tension on the bearing, keeping it in contact with the pressure plate.

Does throwout bearing always touch pressure plate?

Yes the bearing always rides on the pressure plate fingers. The PP is the only thing that pushes the slave back. It's a bearing, it's made to rotate, just like any other bearing on your car.

How do I know if my throwout bearing is bad?